| Project/Area Number |
05452068
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理学一般
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KUGA Takahiro The University of Tokyo, College of Arts and Sciences Associate Professor, 教養学部, 助教授 (60195419)
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| Co-Investigator(Kenkyū-buntansha) |
HIRANO Takuya The University of Tokyo, College of Arts and Sciences Research Associate, 教養学部, 助手 (00251330)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1994: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1993: ¥5,200,000 (Direct Cost: ¥5,200,000)
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| Keywords | Dressed Atom / Multi-Photon Laser / Cavity Quantum Electro-Dynamics / Magneto-Optical Trap / Diode Laser with External Cavity / Laser Spectroscopy / Hyperfine Splitting |
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| Research Abstract |
The purpose of this project is to obtain the basic spectroscopic data for realizing the multi-photon laser oscillator.
We constructed an extended cavity diode laser system and a vacuum chamber for the magneto-optical trap of rubidum atoms. The frequency of the diode laser is stabilized and locked to one of the hyperfine transitions of rubidium atom under the computer control.
At first, by using the diode laser system, we performed a saturation spectroscopy of rubidium atom which is sealed in a glass cell. We observed the optical transitions between hyperfine sublevels of ^<85>Rb and ^<87>Rb. Spectral resolution is about 10MHz, which is determined by the natural linewidth of the transitions. A various kind of saturation spectra is obtained if we changed the polarization of the lasers or the external magnetic field. We analyzed most of those spectra.
Next, we trapped rubidium atoms magneto-optically. About 10^5 atoms were trapped in the trap region of about 1mm^3. The atom density was almost 100 times as dense as that of the atomic beam of Ba which was used for the two-photon laser oscillation by Mossberg in 1992.
We are now continuing our investigation of the basic process of the multi-photon laser oscillation. We will make a larger vacuum chamber and put a high finesse optical cavity in the chamber to realize the two-photon laser oscillator.
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